## louis413 3 years ago During an diffusion experiment, it took 75 seconds for a certain number of moles of an unknown gas to pass through a tiny hole. Under the same conditions, the same number of moles of oxygen gas passed through the hole in 30 seconds. What is the molar mass of the unknown gas?

$\frac{\text{Rate}_1}{\text{Rate}_2}=\sqrt{\frac{M_2}{M_1}}$ where $$M_i$$ is the molar mass of species $$i$$